26. Barley Grass Powder

Barley grass powder is rich in several sleep-promoting compounds, including GABA, calcium, tryptophan, zinc, potassium, and magnesium. According to a 2018 research review, barley grass powder may promote sleep and help prevent a range of other conditions. People can mix barley grass powder into smoothies, scrambled eggs, salad dressings, and soups. It is available in some food stores and online.